Discourse uses 5 levels (0-4) of trust for users, each level allowing or permitting certain actions, e.g. creating new tags requires trust level 3. The Discourse Team made a pretty decent FAQ on the topic:
Discourse uses 5 levels (0-4) of trust for users, each level allowing or permitting certain actions, e.g. creating new tags requires trust level 3. The Discourse Team made a pretty decent FAQ on the topic: